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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bbc2b1ca2c63487bb00698ae157454e36af65ce4c1aa8fc7d0b1b735685d339' 
  AND token = 'PhlUL1ngmCUy4lWgadj0c+hnV+2CAkBW7adtG/+io9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}